?? ????????????????
????:1????????:??????????
2??????
3???????vx
4???????
5???????
???????????9??????????????6????????? (?? ????????????????????)??11??“??”(??)6????????16???????????20????????????,??6???13????????
?????????????«???»?,???????
??????????????????????????????????6????18?????????????:???????“????”??,6??????????????????????????~7?,?,?????????????????????????????????????????????250~350??????450?,??80~150?,?????150~250??????????????????????,?????????????????13~16????????????,??9~12????
??6????17???:?????????, ?????24???????????????,???(???) ????:?????